In 2015 the authors undertook a portfolio risk assessment (PRA) across the full range of dams owned by a large water company, including earth embankment dams, concrete and service reservoirs. The PRA was based on a Tier 2 assessment as set out in the Guide to Risk Assessment for Reservoir Safety Management (Environment Agency, 2013).

This technical paper details the work undertaken to refine and extend the RARS Tier 2 assessment, ensuring a more comprehensive understanding of the safety of an asset and improved tool to manage the safety of a portfolio of dams.

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